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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Current tax provision:      
U.S. federal $ 0 $ 0 $ 0
State 12 18 12
Foreign 378 1,031 443
Total current provision 390 1,049 455
Deferred tax provision (benefit):      
U.S. federal and state (546) 0 0
Foreign provision (1) (1,364) 473
Total deferred provision (benefit) (547) (1,364) 473
Provision (benefit) for income taxes $ (157) $ (315) $ 928